Lidia what a great question I did a little research and found this that might explain it for you.
All forms of punctuation became standardized with printing, but early punctuation was more related to speaking than to reading. Rhetoric, as the study of speech, needed marks to indicate when the speaker should pause to give emphasis, and that was what early punctuation was based on, rather than being related to the logical structure of written sentences. In elementary school, we still often learn how punctuation is used by thinking of how a sentence is spoken (thus, the injunction to use a comma when you pause). After the invention of printing, grammarians developed a theory of punctuation related to structure rather than sound. While these rules of English punctuation were pretty much established by the end of the 18th century, they are not fixed in stone. Change in punctuation, however, is slower than change in word use.
http://www.nyu.edu/classes/copyXediting/Punctuation.html
On this page you will also notice some differences in languages use of punctuation.
Enjoy abundance in your life today
Everyone have a wonderful day
Peace, Love, Liberty
Kris
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